The title, Twelve Years in the Catholic Church, may perhaps lead one to anticipate some sensational revelation of experiences of a subjective and objective character. The reader will find in these pages nothings of the kind. The reason for the publication of this book is a very simple one. After a certain time has elapsed, in which the ardour of a convert to Catholicism may be supposed to have cooled, he is sometimes asked by former comrades in agnosticism or sectarian fellowship if has found the Catholic Church 'all he anticipated', and whether he ahs not experienced disillusions, possibly the case, the convert replies in the negative, the inquirers are disappointed and cannot understand why the fever lasts and the temperature remains high. This little book is intended to be a partial answer to such questioners.